Analyzing the temperature sensitivity of Fabry-Perot sensor using multilayer graphene diaphragm

Area of Science:

• Materials Science
• Optical Sensors
• Nanotechnology

Background:

• Fabry-Perot interferometers are sensitive optical devices.
• Graphene's unique properties offer potential for advanced sensor applications.
• Miniaturized sensors are crucial for various technological fields.

Purpose of the Study:

• To construct a miniature Fabry-Perot interferometric sensor with ultra-high temperature sensitivity.
• To investigate the performance of a graphene diaphragm in a Fabry-Perot cavity.
• To analyze the sensor's response to temperature variations.

Main Methods:

• Fabrication of an 8-layer graphene diaphragm sensor.
• Integration of the graphene diaphragm onto a ferrule endface.
• Characterization of the Fabry-Perot interferometer's cavity length and temperature sensitivity.
• Validation using analytical models.

Main Results:

• Achieved ultra-high temperature sensitivity of 352 nm/°C.
• Demonstrated good linearity in the 20-60 °C range.
• Observed sensor performance consistent with thermal expansion and deflection models.
• Noted small deflection deformation of the ultra-thin diaphragm under higher loads.

Conclusions:

• The developed graphene diaphragm Fabry-Perot sensor exhibits exceptional temperature sensitivity.
• The sensor's performance is well-described by theoretical models.
• Graphene diaphragms are promising for high-sensitivity miniature optical sensing applications.